Pump piston



April 21, 1925. 1,534,225

' F. J. LEMIEUX PUMP PISTON Filed Sept. 28, 1925 FIG. 1 FIG. 5.

0 Y 12 m Mm a rmwz Ill-Ill E Patented Apr. .21, 1925.

UNITED FRANK J. LEMIEUX, or rawruoirnr, a

PUMP PISTON.

HOIDE ISLAND.

Application filcdlseptember 28, 1923. Serial No. 665,365.

To all whom it may concern:

Beit known that I, FRANK J. citizen of the United States of Liii inrix, a America, re-

siding at Pawtucket, in the county of Proyi- 5 clence and State of Rhode Island, have invented certain new and useful Improvements' 'in Pump Pistons, ofwhich the follow. ing is a spec fication. f

This invention relates to mprovements in pistons for use in ing molten type metal 'into molds adapted for forming type.

In monotype, linotype, intertype, linertype and linergraph machines, wherein molten metal is handled for forming type, it is the general practice to employ a structure which includes a melting cylinder properly molten metal from the ing the same to the type molds.

pot with a pump positioned to receive the pot for forcibly feed- Such pump cylinders, for practical purposes, are provided withsmall bores approximately seveneighths of an inch to two inches in diameter and are usually equipped pistons which with solid plug speedily wear out. It is,

therefore, necessary to replace the entire piston every time it becomes so worn that it no longer fits the cylinder 4 g It is very obvious that the solid plug tons now in use should be replaced, by

bore.

p15 pisinto their respective grooves,

diameter and consequently over the piston head, without breaking.

In the monotype, or

single type ca stin machine's," these solid plug pistons are usually provided with a po 0 pa ew y through which the molten metal is allowed to pass to reach the portion inder in advance of thepiston head. diameter of this port or ly regulates the amount of the pump cyl- The passageway naturalof molten metal fed into the cylinder during each stroke of the piston, constant.

which amount should be maintained The passage of molten through the port has a tendency to result that too much metal is fed metal or passageway, however, enlarge the same with the into the cylinder after the piston head has been in use for a time.

This condition, also, necespumps employed for fore sitates the head.

It is, therefore, this invention to replacing of the entire piston an important object ,of provide a piston head which may be disassembled for permitting packing rings grooves without danger A further provi as a pist a plurality o feeding port or passageway formed entirely within one replaced, wl

placing of the entire piston head.

objects and advantages of the inwill be apparent during of the following Other vention to be placed in their respective of breaking.

object of the invention is to on head which is formed from f parts with a moltenmetal part so that the latter may be ien the port or passageway be,- C'OlllGS too large to efiiciently perfom its de sired function, without necessitating the rethe course description.

In the accompanying drawing forming a part of this specification and in which like numerals are employed to designate like parts throughout the same,

Figure l is an elevational view menta-i'y portion of a piston embodying this invention,

of a frag.-

Figure 2 is a detail elevational view of a removable end portion which forms a part of the piston head shown in Fig. 1,

Figure 3 is an end plan view of the removable end portion shown in Fig. 2,

Figure 4 is a detail-elevationalview of a removable the piston spacer ring which forms a part of embodying this invention,

Figure 5 is a. partly elevational view and partly section al view of the piston embodying this invention taken upon lines VV of Fig. 1,

Figure 6 a transverse sectional view taken upon line VI-VI of Fig. 5.

Figure 7 is a 7 taken upon line VII-VII transverse sectional view.

ofll g. 5, and

Figure 8 is a partly elevational and partly sectional view of amodified form of piston embodying this invention.

7 Referring to the larly to Figures 1 drawings and partieuto 7 inclusive, the numeral 10 designates a fragmentary portion of a piston rod having an enlarged end portion 11 which is formed with a. reduced ring receiving extension 12 forming a shoulder portion 13, as illustrated.

portion is pr threaded b0 This enlarged end ovided with an axially arranged whi h s dap ed forte ceiving the externally screw threaded stud carried by the removable spacer ring 16 which is employed for retaining the upper split packing ring 17 in position within the ring recelving portion formed in the enlarged end portion 11 by the extension 12. 7

This removable spacer ring 16 is provided with a reduced ring receiving extension 18 which is provided with an internally screw threaded recess 19 that is adapted for receiving the externally screw threaded boss 20 formed on the removable end portion 21. This removable end portion is provided with an annular groove 22 formed in its side wall which communicates with the transversely extending portion 23 of a port or. passageway formed in the removable end portion 21. This transversely extending passageway portion 23 communicates at its inner end with an axially extending portion 2a of the port or passageway which terminates at its outer end at the outer face of the removable end portion 21. This end portion 21 is further provided with a reduced extension 25 which may be formed with a knurled surface or of square formation for the purpose of receiving a wrench to facilitate connecting the end portion 21 and the removable spacer ring 16 to the piston rod 10. A second split packing ring 17 is positioned within the ring receiving portion formed in the spacer ring 16 and is retained in itsproper position by the removable end portion 21.

In assembling the piston construction just described, the split packing ring 17 is first positioned upon the rod 10 after which the removable spacer ring 16 is secured to the said rod. The second split packing ring 17 is then positioned upon the spacer ring 16 and the end portion 21 is then attached to the spacer ring.

In the type of piston shown in Figure 8, there is provided a piston rod 26having a tapered socket 27, of square formation in transverse section, formed therein. An enlarged end portion 28 having a tapered shank 29, of similar formation to the socket 27, is adapted to be removably secured to the end of the piston rod by inserting the said shank into the socket and locking the same therein by a transversely extending pin 30. The enlarged end portion 28 is provided with a packing ring receiving portion 31 and an internally screw threaded bore 32. The split packing ring 33 is receivable in the portion 31 while the bore 32 is adapted for receiving the threaded stud 34: carried by a spacer ring 35. This spacer ring 35 is similarly formed to the spacer ring 16, shown in Figs. 1 and I to 6 inclusive, and is adapted for receiving the split, packing ring 33 in the manner illustrated. The end portion 36 is removably connected to the spacer ring 35 by the same construction illustrated and described in connection with the removable end portion 21 forming a part of the piston head shown in Figs. 1 to 7 1nclusive. This removable end portion 36 is not provided, however, with a port or passageway.

.It will be apparent, to the art, that the type of Fig.8 is especially adapted for use in slug casting machines. The manner of assembling this piston head is identical with that of the head previously described with the exception that the enlarged end portion 28 may be removed from the piston rod 26 by withdrawingthe transverse pin 30. y

It will be seen that these piston struc. tures permit the placing of split packing rings of very small diameter upon a piston head and for replacing the portion of a head which has formed therein a molten metal feeding port or passageway.

It is to be understood that the forms of this invention herewith shown and described are to be taken as the preferred examples of the same, and that various changes in the shape, size, and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

Having thus described the invention, I claim 1. A piston of a type adapted for permitting a predetermined amount of molten metal to pass therethrough during its reciprocating movement within a cylinder, said piston comprising a piston rod, and a piston head formed of a plurality of separate parts detachably secured to said rod, one of said detachable parts having a passageway the-rethrough adapted for permitting the fiow of metal through said head.

2. A piston of a type adapted for permitting a predetermined amount of molten metal to pass therethrough during its .recipro-cating movement within a "cylinder, said piston comprising a piston rod, a ring receiving portion formed on said rod, a spacer ring detachably secured to said rod, a ring receiving portion formed thereon, and a removable end portion secured to the spacer ring having a passageway therethrough adapted for permitting the flow of metal through said head.

3. In a piston of the type described, a piston rod having an enlarged end portion, a packing ring receiving portion formed in said end, a spacer ring removably secured to the enlarged end portion, a packing ring receiving portion formed in the spacer ring, and a removable end portion secured to the spacer ring, said spacer ring and end portion being adapted for being removed to permit the placing of packing rings in their proper places, said removable end portion having a passagewa therethrough for permitting. a flow of mo ten metal through those skilled in piston shown in the head during its reciprocating movement Within a cylinder, said end portion being replaceable when said passageway becomes Worn out.

4-. In a piston of the type described, a piston rod carrying an enlarged end portion, a packing ring receiving portion formed in said end, a packing ring in said portion, a spacer ring having a packing ring receiving portion reniovably secured to 10 A said enlarged end portion, a packing ring in said portion, an end portion, and means for reniovably connecting said end portion to said spacer ring.

In testimony whereof I aflix n'iy signal5 ture.

FRANK J. LEMIEUX. 

